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The disk inclination and position angle are determined to be $i=49.5\\degr\\pm3.5\\degr$ and $\\mathrm{PA}=18.2\\degr\\pm3.5\\degr$ and the dusty and gaseous disk are detected up to $\\sim220$ au and $\\sim400$ au from the star, respectively. Most importantly, our continuum observations indicate that the cavity size in the mm-sized dust distribution must be $\\sim97$ au in radius, the largest cavity observed around a T Tauri star. Our data clearly confirms the presence of \\co(2-1) well inside the dust cavity. 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Hales, A. Hardy, C. C\\'aceres, C. Pinte, F. M\\'enard, G. S. Mathews, H. Canovas, J. P. Williams, L. Cieza, M. R. Schreiber, P. Rom\\'an, S. Casassus","submitted_at":"2015-03-16T20:00:49Z","abstract_excerpt":"We present ALMA (Cycle 0) band-6 and band-3 observations of the transition disk Sz\\,91. The disk inclination and position angle are determined to be $i=49.5\\degr\\pm3.5\\degr$ and $\\mathrm{PA}=18.2\\degr\\pm3.5\\degr$ and the dusty and gaseous disk are detected up to $\\sim220$ au and $\\sim400$ au from the star, respectively. Most importantly, our continuum observations indicate that the cavity size in the mm-sized dust distribution must be $\\sim97$ au in radius, the largest cavity observed around a T Tauri star. Our data clearly confirms the presence of \\co(2-1) well inside the dust cavity. 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